/usr/share/psychtoolbox-3/PsychRadiometric/TrolandsToQuanta.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | function quanta = TrolandsToQuanta(wl,trolands,S_vLambda,vLambda)
% quanta = TrolandsToQuanta(wl,trolands,S_vLambda,vLambda)
%
% Convert from photopic trolands to quanta (sec-1 degree-2)
% for a monochromatic light.
%
% See W&S, p. 103.
%
% 8/15/96 dhb, abp Wrote the header.
% 8/22/96 dhb Wavelength should be in meters.
wls_vLambda = MakeItWls(S_vLambda);
index = find(wl == wls_vLambda);
quanta = trolands*(wl*1e-9)/(vLambda(index)*4.454e-13);
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